Waste heat recovery device

Abstract

The utility model relates to the technical field of waste heat recovery equipment, and discloses a waste heat recovery device which is characterized in that the waste heat recovery device comprises a shell and two liquid storage tanks, an air inlet pipe and an air outlet pipe are arranged on two opposite side faces of the shell, steam enters and exits from an inner cavity of the shell through the air inlet pipe and the air outlet pipe, and a heat absorption system is arranged in the inner cavity and comprises a communication mechanism. And each liquid storage tank can be independently communicated with the heat absorption system through a communication mechanism to form a closed circulating water path so as to alternately provide circulating water to the heat absorption system. According to the utility model, the problem that the whole waste heat utilization device stops running in the process of replacing circulating water in the heat absorption system is solved, and the recovery efficiency of steam heat is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery equipment, in particular to a waste heat recovery device. Background Art

[0002] A steam turbine is a rotary steam power device. High-temperature and high-pressure steam passes through a fixed nozzle to become an accelerated air flow and then jets onto the blades to drive their rotation, while doing external work. However, there is still some excess steam with a relatively high temperature during the operation of the steam turbine. At this time, a device is usually required to recover and utilize the thermal energy of the steam.

[0003] When the existing waste heat utilization device of a thermal power plant steam turbine recovers the waste heat of steam, it usually uses an endothermic system to recover the thermal energy in the steam. However, in the actual use process, when the circulating water in the endothermic system absorbs enough thermal energy, its waste heat recovery and utilization effect will become worse and worse. At this time, the circulating water in the endothermic system needs to be replaced. During the process of replacing the circulating water, the entire waste heat recovery device will stop operating, greatly reducing the recovery efficiency of the steam heat. Summary of the Utility Model

[0004] A technical problem to be solved by the utility model is that the operation mode of replacing the circulating water greatly reduces the working efficiency of the device.

[0005] In order to achieve the above object, the utility model provides a waste heat recovery device, which includes a housing and two liquid storage tanks. On two opposite sides of the housing, an air inlet pipe and an air outlet pipe for steam to enter and exit the inner cavity of the housing are provided. An endothermic system is arranged in the inner cavity. The endothermic system includes a communication mechanism. Each liquid storage tank can be separately communicated with the endothermic system through the communication mechanism and form a closed circulating water path to alternately supply circulating water to the endothermic system.

[0006] Preferably, the two liquid storage tanks are arranged on the top surface of the housing. The endothermic system includes a condensation pipeline. One end pipe orifice of the condensation pipeline is connected to a water pump; the communication mechanism includes a first communication pipeline and a second communication pipeline. The first communication pipeline is used to communicate the two liquid storage tanks with the water pump, and the second communication pipeline is used to communicate the other end pipe orifice of the condensation pipeline with the two liquid storage tanks; the communication mechanism further includes a first solenoid valve for controlling the first communication pipeline and a second solenoid valve for controlling the second communication pipeline.

[0007] Preferably, the first communication pipeline includes a first T-shaped pipe, and the second communication pipeline includes a second T-shaped pipe. Both side branch orifices of the first T-shaped pipe and the second T-shaped pipe are connected with elbow pipes. The other end pipe orifice of each elbow pipe is connected with a straight pipe. The other end of each straight pipe is connected to the bottom of the two liquid storage tanks; the main pipe orifice of the first T-shaped pipe is connected to the water pump, and the main pipe orifice of the second T-shaped pipe is connected to the outlet of the condensation pipe.

[0008] Preferably, two first solenoid valves are respectively arranged at the joints of the first communication pipeline and each liquid storage tank to control the communication between each liquid storage tank and the first communication pipe, and two second solenoid valves are respectively arranged at the joints of the second communication pipe and each liquid storage tank to control the communication between each liquid storage tank and the second communication pipe.

[0009] Preferably, the air outlet pipe of the housing is higher than the air inlet pipe to increase the flow distance of the steam in the inner cavity, and the condensate horizontal pipe of the condensate pipeline is flush with the low end position of the air inlet pipe to enhance the condensate effect of the condensate pipeline on the steam.

[0010] Preferably, a plurality of support columns and a liquid collection tank are arranged at the low end of the housing, and the liquid collection tank communicates with the inner cavity.

[0011] Preferably, an infusion straight pipe is arranged at the central position of the bottom of the housing. One end of the infusion straight pipe communicates with the inner cavity, and the other end communicates with the liquid collection tank. A first liquid valve is arranged in the infusion straight pipe to control the flow of the infusion straight pipe. An observation window for observing the water level of the liquid collection tank and a second water outlet pipe are arranged on the side surface of the liquid collection tank. A second liquid valve is arranged in the second water outlet pipe to control the flow of the second water outlet pipe.

[0012] Preferably, the connection between the liquid collection tank and the inner cavity is at the lowest point of the bottom surface of the inner cavity, and the bottom surface of the inner cavity forms inclined surfaces extending obliquely on both sides of the connection to enable the condensed water to flow to the connection along the inclined surfaces.

[0013] Preferably, a water temperature display mechanism is arranged on each liquid storage tank to observe the water temperature of the circulating water in the liquid storage tank at any time. An inlet pipe and a first outlet pipe for the circulating water to enter and exit the liquid storage tank are arranged on two opposite planes of each liquid storage tank. A third liquid valve is arranged in each inlet pipe to control the flow of the inlet pipe, and a fourth liquid valve is arranged in each first outlet pipe to control the flow of the first outlet pipe.

[0014] Preferably, the water temperature display mechanism includes a temperature display and a liquid temperature sensor. The temperature display is fixed outside the liquid storage tank, the liquid temperature sensor is arranged in the liquid storage tank and is signal-connected to the temperature display, and the temperature measuring rod of the liquid temperature sensor is vertically arranged along the height direction of the liquid storage tank.

[0015] Through the above technical solutions, the two liquid storage tanks of the waste heat recovery device provided by the present utility model alternately supply circulating water to the heat absorption system, avoiding the need to stop the entire device during the process of replacing the circulating water in the heat absorption system, and greatly improving the waste heat recovery efficiency of the steam. <( BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of the waste heat recovery device of the present utility model;

[0017] Figure 2 isFigure 1 Rear perspective view of the waste heat recovery device shown;

[0018] Figure 3 Schematic diagram of the internal structure of the housing of the present utility model;

[0019] Figure 4 Schematic diagram of the connection structure between one end of the heat absorption system of the present utility model and the liquid storage tank;

[0020] Figure 5 Schematic diagram of the connection structure between the other end of the heat absorption system of the present utility model and the liquid storage tank.

[0021] Explanation of reference numerals in the drawings

[0022] 1. Housing; 101. Inner cavity; 102. Air inlet pipe; 103. Air outlet pipe; 104. Inclined surface; 105. Support column; 106. Straight liquid delivery pipe; 2. Heat absorption system; 201. Condensation pipeline; 202. Water pump; 203. First T-shaped pipe; 204. Second T-shaped pipe; 205. Straight pipe; 206. Elbow pipe; 207. Condensation horizontal pipe; 208. Condensation straight pipe; 3. Liquid storage tank; 301. Water inlet pipe; 302. First water outlet pipe; 303. Temperature display; 304. Liquid temperature sensor; 305. Temperature measuring rod; 4. Liquid collection tank; 401. Observation window; 402. Second water outlet pipe; 403. Fixed plate. Detailed implementation manners

[0023] The following further describes in detail the implementation manners of the present utility model in conjunction with the drawings and embodiments. The detailed descriptions and drawings of the following embodiments are used to exemplarily illustrate the principles of the present utility model, but cannot be used to limit the scope of the present utility model. The present utility model can be implemented in many different forms, is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

[0024] The present utility model provides these embodiments to make the present utility model thorough and complete, and to fully express the scope of the present utility model to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of the components and steps described in these embodiments, the components of the materials, the numerical expressions and values should be interpreted as merely exemplary, rather than as limitations.

[0025] It should be noted that in the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is greater than or equal to two; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0026] In addition, the "first", "second" and similar terms used in the present utility model do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Terms such as "comprising" or "including" mean that the elements before the term cover the elements listed after the term, and do not exclude the possibility of also covering other elements.

[0027] It should also be noted that in the description of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] All terms used in the present utility model have the same meaning as understood by those of ordinary skill in the technical field to which the present utility model belongs, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, for example, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such here.

[0029] For technologies, methods and devices known to those of ordinary skill in the relevant field, detailed discussion may not be made, but where appropriate, the technologies, methods and devices should be regarded as part of the specification.

[0030] Refer to Figure 1 and Figure 3 As shown, the waste heat recovery device includes a housing 1 and two liquid storage tanks 3. Air inlet pipes 102 and air outlet pipes 103 for steam to enter and exit the inner cavity 101 of the housing are provided on two opposite sides of the housing 1. An endothermic system 2 is provided in the inner cavity 101. The endothermic system 2 includes a communication mechanism. Each liquid storage tank 3 can be individually communicated with the endothermic system 2 through the communication mechanism and form a closed circulating water path to alternately supply circulating water to the endothermic system 2.

[0031] Among them, the intake pipe is connected to the steam delivery device to discharge steam into the inner cavity 101. The heat absorption system 2 can exchange heat with the steam in the inner cavity 101. The exhaust pipe is connected to the steam recovery device to discharge the condensed steam out of the inner cavity 101.

[0032] In the waste heat recovery device of the present utility model, the two liquid storage tanks 3 can be separately connected to the heat absorption system 2 in the inner cavity 101 through a communication mechanism and form a circulating water path, so as to alternately supply circulating water to the heat absorption system 2.

[0033] It can be understood that when the temperature of the circulating water in one of the liquid storage tanks 3 is too high, the connection between the liquid storage tank 3 and the heat absorption system 2 is disconnected by using the communication mechanism, and the other liquid storage tank 3 is connected to the heat absorption system 2 to supply low-temperature cooling water to the heat absorption system 2. Therefore, it is avoided that the whole device stops operating during the process of replacing the circulating water in the heat absorption system 2, and the waste heat recovery efficiency of the steam is greatly improved.

[0034] In some embodiments, as Figure 1 shown, the two liquid storage tanks 3 are arranged on the top surface of the housing 1, and there is a gap between the two liquid storage tanks 3 to avoid heat exchange between the two liquid storage tanks 3. The heat absorption system 2 may include a condensation pipeline 201, and a water pump 202 may be connected to one end of the condensation pipeline 201.

[0035] The communication mechanism of the present utility model can have any appropriate structure, such as Figure 3 the embodiment shown, the communication mechanism includes a first communication pipeline and a second communication pipeline.

[0036] Among them, the first communication pipeline can be used to connect the two liquid storage tanks 3 with the water pump 202, and the second communication pipeline can be used to connect the other end of the condensation management with the two liquid storage tanks 3.

[0037] In addition, the communication mechanism may further include a first electromagnetic valve for controlling the first communication pipeline and a second electromagnetic valve for controlling the second communication pipeline. The first electromagnetic valve and the second electromagnetic valve are used in cooperation to control the two liquid storage tanks 3 to be alternately connected to the condensation pipeline 201.

[0038] As Figure 3 sshown, the circulating water in the liquid storage tank 3 flows into the water pump 202 through the first communication pipeline. Subsequently, the water pump 202 drives the circulating water to flow along the condensation pipeline 201, exchanges heat with the steam in the inner cavity 101, and finally flows back to the liquid storage tank 3 through the second communication pipeline.

[0039] Of course, in some other embodiments, the water outlet direction of the water pump 202 can be changed so that the circulating water flows into the condensation pipeline 201 from the second communication pipeline and then flows back to the liquid storage tank 3 through the first communication pipeline.

[0040] In some embodiments, referring to Figure 4 and Figure 5 as shown, the first connecting pipeline may include a first T-shaped pipe 203, and the second connecting pipeline may include a second T-shaped pipe 204.

[0041] Wherein, elbows 206 are connected to both side branch ports of the first T-shaped pipe 203 and the second T-shaped pipe 204. The other end of each elbow 206 is connected to a straight pipe 205, and the other end of each straight pipe 205 is connected to the bottom of two liquid storage tanks 3. When the water pump 202 drives the circulating water to flow into the condensation pipeline 201; meanwhile, the water in the liquid storage tank 3 will flow into the condensation pipeline 201 from the pipe orifice of the condensation pipeline 201 connected to the second T-shaped pipe 204 under the action of gravity, thereby shortening the time for filling the condensation pipeline 201 with water and improving the working efficiency.

[0042] Wherein, the main pipe orifice of the first T-shaped pipe 203 is connected to the water pump 202, and the main pipe orifice of the second T-shaped pipe 204 may be connected to the other end pipe orifice of the condenser. Of course, in some other embodiments, two hoses may be selected to replace the first T-shaped pipe 203. One end of each hose is communicated with the bottom of the liquid storage tank 3, and the other end is communicated with the water pump 202.

[0043] Referring to Figure 4 and Figure 5 as shown, the contact area between the first T-shaped pipe 203 and the second T-shaped pipe 204 in the present utility model with the outside world is small, reducing the heat exchange amount between the circulating water and the outside world and improving the heat recovery efficiency of the device.

[0044] In some embodiments, a first solenoid valve is provided at the connection between the first connecting pipeline and the bottom surface of each liquid storage tank 3, and a second solenoid valve is provided at the connection between the second connecting pipeline and the bottom surface of each liquid storage tank 3. By controlling the opening and closing of the first solenoid valve and the second solenoid valve at the connection of the bottom surface of each liquid storage tank 3, the liquid storage tank 3 connected to the condensation pipeline 201 is changed.

[0045] Of course, in some other embodiments, the positions of the first solenoid valve and the second solenoid valve may be arranged in the straight pipe 205 or in the side branch pipes of the first T-shaped pipe 203 and the second T-shaped pipe 204.

[0046] In some embodiments, the air outlet pipes 103 on the opposite sides of the housing 1 may be set such that the air outlet pipes 103 are higher than the air inlet pipes 102 to increase the flow distance of the steam in the inner cavity 101 and thus enhance the heat exchange.

[0047] In some embodiments, the condensation pipeline 201 may include a plurality of condensation straight pipes 208 arranged along the length direction of the inner cavity 101. The length direction of each condensation straight pipe 208 may be the same as the height direction of the inner cavity 101. Both ends of adjacent condensation straight pipes 208 may be connected with condensation cross pipes 207. The condensation cross pipe 207 near one end of the air inlet pipe 102 may be flush with the lowermost position of the air inlet pipe 102. By increasing the convective heat transfer, the condensation effect of the condensation pipeline 201 on the steam is enhanced.

[0048] Wherein, the length of the condensation straight pipe 208 may be greater than the vertical height between the lowermost end of the air inlet pipe 102 and the uppermost end of the air outlet pipe 103, so that the steam exchanges heat with the condensation pipeline 201 all the time during the flowing process in the inner cavity .......

[0049] In some embodiments, four support columns 105 and a liquid collection tank 4 may be arranged on the bottom surface of the housing 1. The support columns 105 lift the housing above the height of the liquid collection tank, which facilitates the installation of the liquid collection tank and avoids the liquid collection tank 4 being crushed by the housing 1. The liquid collection tank 4 is communicated with the inner cavity 101 and is used for collecting the condensed water formed in the inner cavity 101. Of course, other numbers of support columns 105 may also be provided.

[0050] Reference Figure 4 and Figure 5 As shown, four fixing plates 403 are arranged on the top surface of the liquid collection tank 4 for fixing the liquid collection tank 4 at the bottom of the housing 1.

[0051] Reference Figure 1 and Figure 3 As shown, an infusion straight pipe 106 may be arranged at the central position of the bottom of the housing 1. One end of the infusion straight pipe 106 is communicated with the inner cavity 101, and the other end is communicated with the liquid collection tank 4. A first liquid valve may be arranged in the infusion straight pipe 106 for controlling the flow of the infusion straight pipe 106.

[0052] Wherein, an observation window 401 for observing the water level of the liquid collection tank 4 and a second water outlet pipe 402 are arranged on two adjacent side surfaces of the liquid collection tank 4. A second liquid valve is arranged in the second water outlet pipe 402 for controlling the flow of the second water outlet pipe 402.

[0053] Wherein, the second water outlet pipe 402 is connected with a condensed water recovery device. By closing the first liquid valve and opening the second liquid valve, the condensed water in the liquid collection tank 4 can be recovered. After the recovery is completed, the corresponding second liquid valve is closed, and the first liquid valve is opened to continue collecting the condensed water in the inner cavity 10.......

[0054] In some embodiments, the connection between the liquid collection tank 4 and the inner cavity 101 is at the lowest point of the bottom surface of the inner cavity 101. The bottom surface of the inner cavity 101 forms inclined surfaces 104 that extend obliquely on both sides of the connection, causing the condensed water to flow along the inclined surfaces 104 to the connection, so as to be able to drain the condensed water in the inner cavity 101 completely; of course, the bottom surface of the inner cavity 101 can also form inclined surfaces that extend obliquely around the periphery of the connection.

[0055] In some embodiments, referring to Figure 1 and Figure 2 as shown, on two opposite sides of each liquid storage tank 3, a water inlet pipe 301 and a first water outlet pipe 302 for circulating water to enter and exit the liquid storage tank 3 can be provided.

[0056] Among them, the water inlet pipe 301 is used to communicate with the water supply device. A third liquid valve can be provided in the water inlet pipe 301 to control the on-off state of the water inlet pipe 301. The first water outlet pipe 302 is connected to the heat recovery device, and a fourth liquid valve is provided in the first water outlet pipe 302 to control the on-off state of the first water outlet pipe 302.

[0057] Among them, when the fourth liquid valve is opened, the heat recovery device discharges the circulating water at a higher temperature in the liquid storage tank 3 from the liquid storage tank 3. Subsequently, the fourth liquid valve is closed, and the third liquid valve is opened. The water supply device communicates to input the circulating water at a lower temperature into the liquid storage tank 3, and thus the replacement of the circulating water in the liquid storage tank 3 can be realized.

[0058] In addition, referring to Figure 1 as shown, each liquid storage tank 3 can be provided with a water temperature display mechanism for observing the water temperature in the liquid storage tank 3. The water temperature display mechanism can be provided on the side surface of the liquid storage tank 3 on the same side as the first water outlet pipe 302; of course, in other embodiments, the water temperature mechanism can also be provided at other positions in the liquid storage tank 3, and the present utility model will not elaborate too much here.

[0059] In some embodiments, the water temperature display mechanism can include a temperature display 303 and a liquid temperature sensor 304. The temperature display 303 is fixed outside the liquid storage tank 3, and the liquid temperature sensor is arranged in the liquid storage tank 3 and is electrically connected to the temperature sensor; of course, in other embodiments, other signal connection methods can also be adopted.

[0060] Among them, the temperature measuring rod 305 of the liquid temperature sensor 304 can be arranged vertically along the height of the liquid storage tank 3 to avoid the circulating water entering and exiting at the bottom of the liquid storage tank 3, resulting in a deviation in the water temperature of the circulating water at different depths in the liquid storage tank 3 due to the thermal stratification phenomenon, which affects the measurement of the temperature measuring rod 305 and improves the accuracy of the measurement of the temperature measuring rod 305.

[0061] The preferred embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited thereto. Within the scope of the technical concept of the present utility model, various simple modifications can be made to the technical solution of the present utility model. To avoid unnecessary repetition, the present utility model will not separately explain various possible combinations. But these simple modifications and combinations should equally be regarded as the content disclosed by the present utility model and all fall within the protection scope of the present utility model.

Claims

1. A waste heat recovery device, characterized in that, It includes a housing (1) and two liquid storage tanks (3). On two opposite sides of the housing (1), an air inlet pipe (102) and an air outlet pipe (103) for steam to enter and exit the inner cavity (101) of the housing (1) are provided. An endothermic system (2) is arranged in the inner cavity (101). The endothermic system (2) includes a connecting mechanism. Each liquid storage tank (3) can be individually connected to the endothermic system (2) through the connecting mechanism, and a closed circulating water path is formed to alternately supply circulating water to the endothermic system (2).

2. The waste heat recovery device according to claim 1, characterized in that, The two liquid storage tanks (3) are arranged on the top surface of the housing (1). The endothermic system (2) includes a condensation pipeline (201). One end pipe orifice of the condensation pipeline (201) is connected to a water pump (202); The connecting mechanism includes a first connecting pipeline and a second connecting pipeline. The first connecting pipeline is used to connect the two liquid storages to the water pump (202), and the second connecting pipeline is used to connect the other end pipe orifice of the condensation pipeline (201) to the two liquid storage tanks (3); The connecting mechanism further includes a first solenoid valve for controlling the first connecting pipeline and a second solenoid valve for controlling the second connecting pipeline.

3. The waste heat recovery device according to claim 2, wherein The first connecting pipeline includes a first T-shaped pipe (203), and the second connecting pipeline includes a second T-shaped pipe (204). Both side branch orifices of the first T-shaped pipe (203) and the second T-shaped pipe (204) are connected with elbow pipes (206). The other end pipe orifice of each elbow pipe (206) is connected with a straight pipe (205), and the other end of each straight pipe (205) is connected to the bottom of the two liquid storage tanks (3); The main pipe orifice of the first T-shaped pipe (203) is connected to the water pump (202), and the main pipe orifice of the second T-shaped pipe (204) is connected to the outlet of the condensation pipe.

4. The waste heat recovery device according to claim 2, wherein, The first solenoid valve is arranged at the connection of the first connecting pipeline and each liquid storage tank (3) for controlling the connection between each liquid storage tank (3) and the first connecting pipe. The second solenoid valves are respectively arranged at the connection of the second connecting pipe and each liquid storage tank (3) for controlling the connection between each liquid storage tank (3) and the second connecting pipe.

5. The waste heat recovery device according to claim 2, wherein, The air outlet pipe (103) of the housing (1) is higher than the air inlet pipe (102) for increasing the flow distance of the steam in the inner cavity (101). The condensation cross pipe (207) of the condensation pipeline (201) is flush with the low end position of the air inlet pipe (102) to enhance the condensation effect of the condensation pipeline (201) on the steam.

6. The waste heat recovery device according to claim 2, characterized in that, A plurality of support columns (105) and a liquid collection tank (4) are arranged on the bottom surface of the housing (1). The liquid collection tank (4) is communicated with the inner cavity (101).

7. The waste heat recovery device according to claim 6, characterized in that, At the central position of the bottom of the housing (1), an infusion straight pipe (106) is provided. One end of the infusion straight pipe (106) is communicated with the inner cavity (101), and the other end is communicated with the liquid collection tank (4). A first liquid valve is arranged in the infusion straight pipe (106) to control the flow of the infusion straight pipe (106). An observation window (401) for observing the water level of the liquid collection tank (4) and a second water outlet pipe (402) are arranged on the side surface of the liquid collection tank (4). A second liquid valve is arranged in the second water outlet pipe (402) to control the flow of the second water outlet pipe (402).

8. The waste heat recovery device according to claim 6, characterized in that, The connection between the liquid collection tank (4) and the inner cavity (101) is at the lowest point of the bottom surface of the inner cavity (101). The bottom surface of the inner cavity (101) forms inclined surfaces (104) extending obliquely on both sides of the connection to enable the condensed water to flow along the inclined surfaces (104) to the connection.

9. The waste heat recovery device according to claim 1, characterized in that, A water temperature display mechanism is arranged on each of the liquid storage tanks (3) to observe the water temperature of the circulating water in the liquid storage tank (3) at any time. An inlet pipe (301) and a first outlet pipe (302) for the circulating water to enter and exit the liquid storage tank (3) are arranged on two opposite planes of each of the liquid storage tanks (3). Wherein: a third liquid valve is arranged in each of the inlet pipes (301) to control the flow of the inlet pipe (301), and a fourth liquid valve is arranged in each of the first outlet pipes (302) to control the flow of the first outlet pipe (302).

10. The waste heat recovery device according to claim 9, characterized in that, The water temperature display mechanism includes a temperature display (303) and a liquid temperature sensor (304). The temperature display (303) is fixed outside the liquid storage tank (3). The liquid temperature sensor (304) is arranged in the liquid storage tank (3) and is signal-connected to the temperature display (303). The temperature measuring rod (305) of the liquid temperature sensor (304) is arranged vertically along the height direction of the liquid storage tank (3).

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